How do glass companies know how to mold an hourglass to have the sand fall precisely?
In: Technology
I wonder if the more use an hour glass gets, the more out of time it gets.
considering the sand is always getting smaller and finer, the more you shake it up, or mix it, turn it over, the (ever so slightly) more bits of sand rub up against each other and smooth off the edges, making each part smaller.
also, the hole might get bigger too?
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